Arnd Bergmann ee6a129dff
compat_ioctl: block: add blkdev_compat_ptr_ioctl ...
A lot of block drivers need only a trivial .compat_ioctl callback.
Add a helper function that can be set as the callback pointer
to only convert the argument using the compat_ptr() conversion
and otherwise assume all input and output data is compatible,
or handled using in_compat_syscall() checks.
This mirrors the compat_ptr_ioctl() helper function used in
character devices.
Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk >
Signed-off-by: Arnd Bergmann <arnd@arndb.de >
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